The possibility that the lithium battery cannot be charged is simply the following two situations (exclude the power supply problem and ensure the power supply is good).
1. Lithium battery protection board problem.
Most finished lithium batteries currently used on the market are battery packs containing protective plates. The general functions of protective plates are: 1. Prevent overcharging (overvoltage protection);
2. Protection against overdischarge (usually when the voltage is below 2.8-2.4 V, the protection board will stop the output)
3. Overcurrent protection (normal protection boards usually set the discharge current to); The battery capacity is about 1C-3C. For special requirements, it will be discharged at 5C (C here refers to the capacity ofthe battery).
If your lithium battery cannot be charged, it is likely that the cell is too discharged (lithium batteries that have not been used for a long time are prone to this problem When the battery is left for a long time, the battery voltage will be lower than 2.4 due to self-consumption, and the protection board does not have 0V charging function.) To this. stage, the protection card cannot detect the presence of the battery (the cell voltage is below the threshold), it cannot be charged. The simple solution is to use a power supply. with limited voltage below 3.7V to charge the battery directly and charge the battery voltage on the protection board above the detection threshold, the method should be as follows: pay attention to limit the voltage and charging current to prevent the battery from overheating and swelling.
DSecond, the battery core is damaged and has been left for an extended period of time, and the battery core has completely discharged the electrolyte (liquid). If the battery is dry, you can only do this. replace the battery (the probability of battery damage is proportional to the time spent for a long time. If the battery capacity is less than 1000 mA and is left for more than 2 years, the battery will dry up and the capacity will decrease , and it may even become impossible to charge it The possibility is very high
If the lithium battery cannot be charged for a long time, it can be repaired by charging it. normally charging 3-5 times. If the charger is broken, replace it. But if the problem is with the battery itself, you can only replace it with a new one. >It's not necessarily the problem with the battery itself It's most likely there.a problem with the charger, charging socket and charging socket. If you leave it for a long time, self-discharge will cause the battery to drain. , the capacity will be lower than normal, causing the battery to be too weak and unable to charge. However, lithium batteries easily activate after 3-5 normal charge and discharge cycles can activate the battery and restore its normal capacity.
The reasons why the lithium battery cannot be charged:
1. The lithium battery is in excess
I.e. say, the lithium battery is discharged very weakly, in a deep discharge state, and the energy is essentially exhausted, so that it reaches the cut-off voltage of the lithium battery. At this point, the activation method can be used, but this. This is not necessarily effective.
2. There is a problem with the charger or thehas load line.
First of all, you need to check if there is any problem with the charger. The method is very simple, just measure the output voltage or connect the corresponding voltage. If there is a problem with the line, you need to pay attention to it. It takes some effort. After all, it involves circuit hardware and other issues. If necessary, we can take it apart and analyze it directly.
3. The lithium battery will fail after prolonged use.
The possibility of this happening is relatively low, but it cannot be ruled out. You should familiarize yourself with your own battery and replace it after how long it has been used.
4. There is a problem with the battery charging IC or BMS system.
Due to the imbalance of battery cells and other reasons, problems occur in the battery management system, whichresults in an error of judgment on the part of the management integrated circuit and the inability to detect the voltage or current.